An Azure service for ingesting, preparing, and transforming data at scale.
Self Hosted IR is not working in your ADF. So you can try upgrading it to the latest version.
In fact, product team has done some fixes in the latest Self hosted IR and latest IR should work smooth.
See this thread - https://learn.microsoft.com/en-us/answers/questions/317318/azure-synapse-pipeline-copy-activities-remain-in-a.html?childToView=322824#answer-322824
----------
Please don't forget to Accept Answer and Up-vote if the response helped -- Vaibhav